--- ray/doc/man/man1/ximage.1	2007/09/04 17:36:41	1.5
+++ ray/doc/man/man1/ximage.1	2010/07/08 18:54:39	1.8
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: ximage.1,v 1.5 2007/09/04 17:36:41 greg Exp $"
+.\" RCSid "$Id: ximage.1,v 1.8 2010/07/08 18:54:39 greg Exp $"
 .TH XIMAGE 1 10/27/98 RADIANCE
 .SH NAME
 ximage - RADIANCE picture display for X window system
@@ -88,7 +88,7 @@ and
 .I \-c
 options, which compensate for human contrast and color sensitivity
 at the corresponding scene luminance levels.
-This option yeilds and appearance of the scene on the display that
+This option yields and appearance of the scene on the display that
 closely matches what would be experienced in the real world.
 .PP
 The
@@ -125,14 +125,16 @@ Redraw the entire image.
 .TP
 .BR <return>
 Display the radiance averaged over the area of interest.
+The maximum of the three (RGB) channels is reported.
 .TP
 .BR l
-Display the luminance value in the area of interest.
+Display the photometrically-weighted luminance value in the area of interest.
 This assumes that the image was correctly computed in terms of
 luminance.
 .TP
 .BR c
-Display the color in the area of interest.
+Display the color in the area of interest, as adjusted by the current
+exposure setting.
 .TP
 .BR p
 Display the x and y location of the cursor.